One kind can process porous bench drill simultaneously
Technical field
The utility model is related to drilling machine technical fields, and porous bench drilling can be processed simultaneously more particularly to one kind
Bed.
Background technology
Often it is related to drilling, tapping etc. in pipe fitting production and processing, drilling machine is that preferred drilling and tapping are set
Standby, existing drilling machine is typically all a spindle nose, therefore the work that there are one drill bit can only drill etc, and before drilling
It needs first to cross to each preboring point on workpiece, play punching, the large scale error occurred when to avoid drilling, but so also
It is there can be small-scale scale error, it cannot be guaranteed that dimensional accuracy, and reduces drilling efficiency;And general drilling machine cannot achieve certainly
Dynamic feeding, needs manual operation, time-consuming and laborious, inefficiency, and inconvenient dismounting between each component, not easy to overhaul.
In view of the above technical problems, application No. is the patents of CN201320894001.6 to disclose a kind of multi-hole position annular bit
Hole machine, including drilling machine ontology are equipped with main shaft straight down in the upper end of drilling machine ontology, and main shaft is with setting in drilling machine ontology upper end
Electric-motor drive connection, on the main shaft below drilling machine ontology be equipped with connection shell, connection shell in main the tip of the axis
Equipped with driving gear, multiple driven gears with driving gear cooperation are equipped at intervals in the periphery of driving gear, driven gear
Central shaft setting connects on connection shell, and with housing into rotation is connect, and brill is connected with by universal joint in the lower end of central shaft
Head mounting base, drill-bit installing seat are spindle rotationally arranged on connection shell;It is connected with horizontal slide rail in the lower end of drilling machine ontology,
Horizontal slide rail is equipped with longitudinal slide rail, workbench is fixed in longitudinal slide rail, workbench is located at the underface of main shaft, work
Make platform and is equipped with fixture;Be fixed with holder in the upper end of drilling machine ontology, holder extends to the surface of main shaft, main shaft just on
Cylinder straight down is fixed on the holder of side, the telescopic end of cylinder is connect with main shaft.The technical solution can realize multiple brills
Head is disposably drilled on annular workpieces, however the technical solution has the following disadvantages:It drills now to pipe fitting
The requirement of precision is higher and higher, and the pipe fitting of pipe fitting and drilling different depth to different sizes, borehole accuracy is often
Technology requirement is not achieved.
Utility model content
In view of the above deficiencies of the prior art, the purpose of this utility model is to provide one kind can process simultaneously it is more
The bench drill in hole, can effectively adjusting control to the drilling depth of different size pipe fittings, avoid the occurrence of deep mixed drilling
Error improves Drilling Precision.
The utility model specifically uses following technical scheme to achieve the goals above:
One kind can process porous bench drill, including drilling machine ontology simultaneously, be provided with vertically in drilling machine ontology upper end
Downward main shaft, the main shaft is by toothed belt and the driving motor drive connection in drilling machine ontology upper end is arranged, in the master
The lower end of axis is provided with connection shell, and the main shaft end in connection shell is provided with driving gear, in the periphery of driving gear
Multiple driven gears with driving gear cooperation are arranged at intervals with, the central shaft of the driven gear is arranged on connection shell simultaneously
It is connected with housing into rotation is connect, drill-bit installing seat is connected with by universal joint in the lower end of central shaft, the drill-bit installing seat can
The setting of rotation is provided with the clamping device for multiple pipe fittings to be clamped on connection shell below the drill-bit installing seat,
Be provided on the drilling machine ontology limiting bracket and driving cylinder, the main shaft upper end be upward through limiting bracket and with driving gas
The output shaft of cylinder is rotatablely connected;The upright slide rail slided up and down for limiting bracket and driving limit are provided on the drilling machine ontology
The feed screw nut's assembly that holder is moved along upright slide rail, the limiting bracket are vertically equipped with graduated scale.
The operation principle of the utility model base case is:When carrying out multiple pipe fitting drillings using the above structure,
Multiple pipe fittings are clamped by clamping device on a mobile station first;And then main shaft high-speed rotation is driven by driving motor,
And main shaft is pushed to creep by driving cylinder driving spindle vertically to move;Specifically, main shaft end is provided with actively
Gear drives multiple driven gears with driving gear cooperation to rotate, to pass through setting by driving driving gear rotation
Drill bit on multiple central shafts effectively creeps into multiple pipe fittings, is provided in the technical program for multiple pipes to be clamped
The clamping device of connector effectively can effectively be clamped multiple pipe fittings, and can be right after to multiple pipe fittings effectively locking
It is disposably drilled;Further, it is provided with limiting bracket on drilling machine ontology, passes through the adjustable limit of feed screw nut's assembly
Position holder is moved up and down along upright slide rail, and limiting bracket is vertically equipped with graduated scale, accurately controls limit branch
The height of frame, and main shaft upper end is upward through limiting bracket and is rotatablely connected with the output shaft of driving cylinder, to drive cylinder
Driving spindle can effectively limit main shaft when being moved to the top of limiting bracket and continue to move down, can effectively adjusting control to difference
The drilling depth of size pipe fitting avoids the occurrence of deep mixed drilling error, improves Drilling Precision.
Further, further include PLC processor and power module, the driving motor and driving cylinder respectively at PLC
It manages device and power module is electrically connected.In brill, PLC processor and the driving being electrically connected with PLC processor electricity can be passed through
Machine and the control of driving cylinder improve borehole accuracy, avoid the occurrence of and creep into deep mixed error to the drilling depth of pipe fitting.
Further, non-contact single-point type displacement sensor, the non-contact single-point are provided on the drill-bit installing seat
Formula displacement sensor is electrically connected with PLC processor.It can effectively monitor drill bit by non-contact single-point type displacement sensor and move
The space length of dynamic platform.
Further, the non-contact single-point type displacement sensor is that current vortex sensor, capacitance sensor or spectrum are total
Burnt sensor.STI L spectral confocal sensors are specifically used, or use STI L spectral confocal sensors and current vortex sensor
Or the combination of capacitance sensor, the boundary profile that can rapidly extract pipe fitting obtain its characteristic information, pass through PLC processor
Pipe fitting drilling position can be accurately calculated by analyzing its monochromatic color, can accurately measure nearly all types of material and outer
The complicated pipe fitting of shape, practicability are good.
Further, drilling machine ontology lower end is provided with horizontal guide rail, and movement is slidably connected on the horizontal guide rail
Platform, the clamping device are fixed in the mobile station, and the driving mobile station is provided in the drilling machine ontology along water
The driving mechanism of level gauge movement.Mobile station can be driven to be removed along horizontal guide rail by driving mechanism, avoid boring in the prior art
Head driving part is not turned off and manual movement can have some potential safety problems.
Further, the driving mechanism includes stepper motor and the leading screw that is connect with stepper motor output shaft, the silk
The movable sleeving being fixedly connected with mobile station is provided on thick stick, the movable sleeving is connect with threads of lead screw.By in driving mechanism
Stepper motor can drive leading screw to rotate and drive the movable sleeving being connect with threads of lead screw and the mobile station being arranged on movable sleeving
It is moved along horizontal guide rail, leading screw is threadedly coupled with movable sleeving, and mobile promote is stablized, and is promoting the movement for carrying clamping device
When platform to fixed position, mobile station can be effectively locked, avoids occurring shifting phenomena in process, improves machining accuracy.
Further, the stepper motor is electrically connected with PLC processor and power module respectively.Specifically, before brill
Monitoring data can be transmitted to PLC processor by non-contact single-point type displacement sensor, and by PLC processor and with
Multiple pipe fittings on step motor control clamp system that PLC processor is electrically connected are opposite with the drill bit on drill-bit installing seat
It answers, improves the borehole accuracy to pipe fitting.
Further, the clamping device includes the rotate gear for clamping disk and being arranged concentrically with clamping disk, the clamping
It is provided with multiple station slots corresponding with the drill-bit installing seat on disk, is provided on the clamping disk multiple corresponding with station slot
Clamping hand handle, described clamping hand handle one end is meshed by rotate gear described in engaging tooth, clamps the hand handle other end and setting
Pipe fitting in station slot offsets;The clamping hand handle is bolted after being pushed against with pipe fitting.It can be clamped by rotating
Rotate gear in disk drives station slot movement corresponding with multiple clamping hand handles that rotate gear is meshed simultaneously, to multiple folders
Tight hand handle can be pushed against or be unclamped simultaneously to multiple pipe fittings in station slot simultaneously, without when drilling to multiple pipe fittings
One one lock it, and practicability is good, effectively improves drilling efficiency.
Further, described hand handle and the pipe fitting one end that offsets that clamps is provided with the anchor ear portion of arc shape, and described
The material in the anchor ear portion of arc shape uses nitrile rubber.It can be effectively increased using arc shape anchor ear portion and clamp hand handle and pipe fitting
Anchor ear effect is improved in anchor ear face;And the material in the anchor ear portion of arc shape uses nitrile rubber, nitrile rubber to have certain extension
Property, it can avoid generating it abrasion during clamping hand handle and pushing against pipe fitting, and nitrile rubber wearability is good, can effectively prolong
The long service life for clamping hand handle.
Further, it is fixedly installed rotational handle in the rotate gear.Rotate gear can be driven by rotating hand handle
Rotation, and locked rotate gear by bolt when locking multiple pipe fittings, rotation is convenient, and locking is stablized, can be to more
A pipe fitting is effectively clamped.
As described above, the beneficial effects of the utility model are as follows:
1, the utility model be provided on drilling machine ontology limiting bracket, the upright slide rail slided up and down for limiting bracket and
The feed screw nut's assembly that driving limiting bracket is moved along upright slide rail, by feed screw nut's assembly adjustable limit holder along vertical
Sliding rail moves up and down, and limiting bracket is vertically equipped with graduated scale, accurately controls the height of limiting bracket, and leads
Axis upper end is upward through limiting bracket and is rotatablely connected with the output shaft of driving cylinder, to drive cylinder driving spindle to be moved to
Main shaft can be effectively limited when the top of limiting bracket to continue to move down, can effectively adjusting control to the brills of different size pipe fittings
Into depth, deep mixed drilling error is avoided the occurrence of, improves Drilling Precision.
2, the utility model is provided with the clamping device for multiple pipe fittings to be clamped, and specifically, clamping device includes folder
Tight disk and with the rotate gear that clamps disk and be arranged concentrically, the rotate gear that rotation clamps in disk can be passed through and driven simultaneously and turning gear
It takes turns the multiple clamping hand handles being meshed and corresponds to the movement of station slot, to which multiple clamping hand handles can be simultaneously to multiple pipes in station slot
Connector is pushed against or is unclamped simultaneously, and can disposably be drilled to it after to multiple pipe fittings effectively locking, without to more
One one lock it when a pipe fitting drilling, and practicability is good, effectively improves drilling efficiency.
3, the utility model is provided with the driving mechanism for driving the mobile station to be moved along horizontal guide rail in drilling machine ontology,
Specifically, by the stepper motor in driving mechanism can drive leading screw to rotate drive the movable sleeving that is connect with threads of lead screw and
The mobile station being arranged on movable sleeving is moved along horizontal guide rail, and leading screw is threadedly coupled with movable sleeving, and mobile promote is stablized, and is being pushed away
When into mobile station to the fixed position for carrying clamping device, mobile station can be effectively locked, avoids occurring in process
Shifting phenomena improves machining accuracy.
4, the utility model is provided with non-contact single-point type displacement sensor on drill-bit installing seat, passes through non-contact single-point
Formula displacement sensor can effectively monitor drill bit and the space length of mobile station;Specifically, non-contact single-point type can be passed through before brill
Monitoring data are transmitted to PLC processor by displacement sensor, and be electrically connected by PLC processor and with PLC processor
Multiple pipe fittings on step motor control clamp system are corresponding with the drill bit on drill-bit installing seat, improve the brill to pipe fitting
Hole precision;Monitoring data can be transmitted to PLC processor in real time by non-contact single-point type displacement sensor in brill, and passed through
PLC processor and the driving motor being electrically connected with PLC processor and driving cylinder control carry the drilling depth of pipe fitting
High borehole accuracy avoids the occurrence of and creeps into deep mixed error.
Description of the drawings
Fig. 1 is a kind of schematic diagram that can process porous bench drill embodiment 1 simultaneously of the utility model;
Fig. 2 is a kind of connection that can process control module in porous bench drill embodiment 1 simultaneously of the utility model
Schematic diagram;
Fig. 3 is a kind of side view that can process clamping device in porous bench drill embodiment 1 simultaneously of the utility model
Sectional view;
Fig. 4 is a kind of vertical view that can process clamping device in porous bench drill embodiment 1 simultaneously of the utility model
Figure;
Fig. 5 is a kind of vertical view that can process clamping device in porous bench drill embodiment 2 simultaneously of the utility model
Figure.
Reference numeral:01- drilling machines ontology, 02- main shafts, 03- toothed belts, 04- connections shell, 05- driving gears, 06- from
Moving gear, 07- central shafts, 08- universal joints, 09- drill-bit installing seats, 10- limiting brackets, 11- driving cylinder, 12- horizontal guide rails,
13- mobile stations, 14- clamping devices, 15- stepper motors, 16- leading screws, 17- movable sleevings, 18- clamp disk, 19- rotate gears, 20-
Station slot, 21- clamp hand handle, 22- engaging tooths, 23- bolts, 24- anchor ears portion, 25- rotational handles, 26- graduated scales, 27- brills
Head, 28- driving motors, 29- feed screw nut's assemblies, 30- upright slide rails.
Specific implementation mode
In order to which those skilled in the art are better understood from the utility model, below in conjunction with the accompanying drawings with following embodiment to this
Utility model is described in further detail.
Embodiment 1
Shown in please referring to Fig.1, the present embodiment provides one kind capable of processing porous bench drill, including drilling machine ontology simultaneously
01,01 upper end of drilling machine ontology is provided with main shaft 02 straight down, main shaft 02 is by toothed belt 03 with setting in drilling machine ontology
Driving motor 28 on the left of 01 upper end is sequentially connected, and the lower end of main shaft 02 is provided with connection shell 04, in connection shell 04
02 end of main shaft be provided with driving gear 05, the periphery of driving gear 05 be arranged at intervals with 3 with driving gear 05 coordinate
Driven gear 06, driven gear 06 central shaft 07 setting connection shell 04 on and with connect shell 04 rotation connection,
The lower end of central shaft 07 is connected with 27 mounting base 09 of drill bit, 27 mounting base of drill bit, 09 company of being spindle rotationally arranged in by universal joint 08
On body contact body 04, limiting bracket 10 and driving cylinder 11 are provided on drilling machine ontology 01,02 upper end of main shaft is upward through limit branch
Frame 10 is simultaneously rotatablely connected with the output shaft of driving cylinder 11.
Specifically, the upright slide rail 30 slided up and down for limiting bracket 10 and driving limit branch are provided on drilling machine ontology 01
The feed screw nut's assembly 29 that frame 10 is moved along upright slide rail 30, and limiting bracket 10 is vertically equipped with graduated scale 26 and leads to
29 adjustable limit holder 10 of feed screw nut's assembly is crossed to move up and down along upright slide rail 30, and limiting bracket 10 vertically on
Equipped with graduated scale 26, the height of limiting bracket 10 is accurately controlled;And 02 upper end of main shaft be upward through limiting bracket 10 and with
The output shaft rotation connection for driving cylinder 11, specifically can be arranged turning groove, on main shaft 02 on the output shaft of driving cylinder 11
It is driven by advancing downwardly main shaft 02 with driving 11 output shaft of cylinder rotation connection, driving cylinder 11 in the embedded turning groove in end
Drill bit 27 creep into, to can effectively be limited when 11 driving spindle 02 of cylinder being driven to be moved to the top of limiting bracket 10 main shaft 02 after
It is continuous to move down, effectively can be avoided the occurrence of adjusting control by deep mixed drilling and missed for the drilling depth of different size pipe fittings
Difference improves Drilling Precision.
Further, 01 lower end of drilling machine ontology is provided with horizontal guide rail 12, and mobile station is slidably connected on horizontal guide rail 12
13, and the clamping device 14 for 3 pipe fittings to be clamped is provided in mobile station 13, driving movement is provided in drilling machine ontology 01
The driving mechanism that platform 13 is moved along horizontal guide rail 12;Specifically, driving mechanism includes stepper motor 15 and defeated with stepper motor 15
Go out the leading screw 16 of axis connection, leading screw 16 is provided with the movable sleeving 17 being fixedly connected with mobile station 13, movable sleeving 17 and 16 spiral shell of leading screw
Line connects, and leading screw 16 can be driven to rotate by the stepper motor 15 in driving mechanism by drive the movement being threadedly coupled with leading screw 16
Set 17 and the mobile station 13 being arranged on movable sleeving 17 are moved along horizontal guide rail 12, and leading screw 16 is threadedly coupled with movable sleeving 17,
Mobile promote is stablized, and when propulsion carries mobile station 13 to the fixed position of clamping device 14, can effectively lock shifting
Dynamic platform 13, avoids occurring shifting phenomena in process, improves machining accuracy.
Specifically, further include PLC processor and power module, non-contact single-point type is provided in 27 mounting base 09 of drill bit
Displacement sensor, non-contact single-point type displacement sensor are electrically connected with PLC processor, and driving motor 28, driving cylinder 11
It is electrically connected respectively with PLC processor and power module with stepper motor 15.Can have by non-contact single-point type displacement sensor
The space length of effect monitoring drill bit 27 and mobile station 13;Specifically, it can be incited somebody to action by non-contact single-point type displacement sensor before brill
Monitoring data are transmitted to PLC processor, and the stepper motor 15 being electrically connected by PLC processor and with PLC processor is controlled
3 pipe fittings on clamp system processed are corresponding with the drill bit 27 in 27 mounting base 09 of drill bit, improve the drilling essence to pipe fitting
Degree;Monitoring data can be transmitted to PLC processor in real time by non-contact single-point type displacement sensor in brill, and pass through PLC
Processor and the driving motor 28 being electrically connected with PLC processor and driving cylinder 11 control the drilling depth to pipe fitting,
Borehole accuracy is improved, avoids the occurrence of and creeps into deep mixed error.
In addition, non-contact single-point type displacement sensor is current vortex sensor, capacitance sensor or spectral confocal sensor.
STI L spectral confocal sensors are specifically used, or using STI L spectral confocal sensors and current vortex sensor or capacitance sensing
The combination of device, the boundary profile that can rapidly extract pipe fitting obtain its characteristic information, its monochrome is analyzed by PLC processor
The color of light can accurately calculate pipe fitting drilling position, can accurately measure nearly all types of material and contour structures are complicated
Pipe fitting, practicability is good.
Further, as shown in Figure 3 and Figure 4, clamping device 14 includes clamping disk 18 and being arranged concentrically with clamping disk 18
Rotate gear 19 clamps and is provided with 3 station slots 20 corresponding with 27 mounting base 09 of drill bit on disk 18, clamps and is provided on disk 18
3 clamping hand handles 21 corresponding with station slot 20 clamp hand handle 21 close to the one end in disk 18 center of circle is clamped and pass through 22 turns of engaging tooth
Moving gear 19 is meshed, and clamps hand handle 21 far from the other end and the pipe fitting phase being arranged in station slot 20 for clamping 18 center of circle of disk
It supports;It clamps after hand handle 21 is pushed against with pipe fitting and is fixed by bolt 23.The rotate gear 19 that can be clamped by rotation in disk 18 is same
When drive with rotate gear 19 is meshed 3 clamp the correspondings station slot 20 of hand handles 21 and move, so that 3 clamping hand handles 21 can be same
When 3 pipe fittings in station slot 20 are pushed against or are unclamped simultaneously, without when drilling to 3 pipe fittings 1 to its into
Row locking, practicability is good, effectively improves drilling efficiency.
Specifically, it hand handle 21 and the pipe fitting one end that offsets is clamped is provided with the anchor ear portion 24 of arc shape, and arc shape is embraced
The material of hoop portion 24 uses nitrile rubber, and the anchor ear for clamping hand handle 21 and pipe fitting can be effectively increased using arc shape anchor ear portion 24
Anchor ear effect is improved in face;And the material in the anchor ear portion 24 of arc shape uses nitrile rubber, nitrile rubber to have certain extension
Property, it can avoid generating it abrasion during clamping hand handle 21 and pushing against pipe fitting, and nitrile rubber wearability is good, it can be effective
Extend the service life for clamping hand handle 21.
In addition, being fixedly installed rotational handle 25 in rotate gear 19,19 turns of rotate gear can be driven by rotating hand handle
It is dynamic, and locked rotate gear 19 by bolt 23 when locking 3 pipe fittings, rotation is convenient, and locking is stablized, can be to 3
A pipe fitting is effectively clamped.
In this example, can 30mm drillings be carried out to 3 pipe fittings simultaneously, 3 pipe fittings are existed by clamping device 14 first
It is clamped in mobile station 13, specifically, drives rotate gear 19 to rotate by rotational handle 25 by drive 3 clamping hand handles 21
It is moved along 20 direction of station slot, pipe fitting is held tightly by clamping the anchor ear portion 24 in hand handle 21, after holding, passes through bolt
23 are locked at rotate gear 19 in mobile station 13;Further, drive mobile station 13 along horizontal guide rail 12 by driving mechanism
It is moved to the underface of 27 mounting base 09 of drill bit, it can be quick by the spectral confocal sensor being arranged in 27 mounting base 09 of drill bit
The boundary profile of ground extraction pipe fitting obtains its characteristic information, and analyzing its monochromatic color by PLC processor can be accurate
It calculates pipe fitting and creeps into position, accurate drilling is realized in the drilling position of corresponding pipe fitting.
At the same time, it is moved up and down along upright slide rail 30 by 29 adjustable limit holder 10 of feed screw nut's assembly, it can essence
The really height of control limiting bracket 10, and it is 30mm to adjust limiting bracket 10 at a distance from driving cylinder 11, to which control pipe connects
The drilling depth of head.
In drilling process, specifically 02 high-speed rotation of main shaft can be driven by driving motor 28, and then drive by main shaft 02
Driving gear 05 rotates and 3 driven gears 06 coordinated with driving gear 05 is driven to rotate, to by being arranged at 3 centers
Drill bit 27 on axis 07 effectively creeps into 3 pipe fittings, at the same time, is driven by the driving cylinder 11 on limiting bracket 10
Dynamic main shaft 02 is vertically mobile to push main shaft 02 to creep into, and avoiding the occurrence of deep mixed drilling by limiting bracket 10 misses
Difference, and monitoring data are transmitted to by PLC processor by spectral confocal sensor in real time, and pass through PLC processor and and PLC
The driving motor 28 and driving cylinder 11 that processor is electrically connected control the drilling depth to pipe fitting, further increase drilling essence
Degree avoids the occurrence of and creeps into deep mixed error.
Finally, the pipe fitting of finishing drilling can by the stepper motor 15 in driving mechanism drive leading screw 16 rotate by drive and silk
The movable sleeving 17 of the threaded connection of thick stick 16 and the mobile station 13 being arranged on movable sleeving 17 are removed along horizontal guide rail 12, are avoided existing
27 driving part of drill bit is not turned off in technology and manual movement can have some potential safety problems.
Embodiment 2
Embodiment 2 is substantially the same manner as Example 1, the difference is that:As shown in figure 5, clamping device 14 includes clamping
Disk 18 and the rotate gear 19 being arranged concentrically with clamping disk 18, clamp and are provided with and 27 mounting base 09 corresponding 4 of drill bit on disk 18
A station slot 20 clamps and is provided with 4 clamping hand handles 21 corresponding with 4 station slots 20 on disk 18, clamps hand handle 21 close to folder
The one end in tight 18 center of circle of disk is meshed by 22 rotate gear 19 of engaging tooth, clamps hand handle 21 far from the another of 18 center of circle of clamping disk
The pipe fitting held and be arranged in station slot 20 offsets;It clamps after hand handle 21 is pushed against with pipe fitting and is fixed by bolt 23, can be led to
Rotation is crossed to clamp the rotate gear 19 in disk 18 while driving station corresponding with 4 clamping hand handles 21 that rotate gear 19 is meshed
Slot 20 moves, and to which 4 clamping hand handles 21 can be pushed against or be unclamped simultaneously to 4 pipe fittings in station slot 20 simultaneously, is not necessarily to
One one lock it when drilling to 4 pipe fittings, and practicability is good, further increases drilling efficiency.
In this example, the peripheral corresponding interval of driving gear 05 is provided with 4 driven gears coordinated with driving gear 05
The setting of central shaft 07 of 06,4 driven gear 06 is rotatablely connected on connection shell 04 and with shell 04 is connect, in central shaft 07
Lower end 4 27 mounting bases of drill bit, 09,4 27 mounting bases 09 of drill bit be connected with by universal joint 08 be spindle rotationally arranged in connection
On shell 04 and corresponding 4 pipe fittings are arranged.
The above, the only preferred embodiment of the utility model, are not intended to limit the utility model, the utility model
Scope of patent protection be subject to claims, it is equivalent made by every specification and accompanying drawing content with the utility model
Structure change similarly should be included in the scope of protection of the utility model.